单项选择题
A.1~5 B.5~10 C.10~15 D.15~20
A.0.5mm B.1mm C.1.5mm D.2mm
A.0.5mm B.0.8mm C.1mm D.1.2mm
A.50mm±0.5mm B.50mm±1mm C.50mm±1.5mm D.50mm±2mm
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